Automatic check-valve for compressed-air drilling-machines.



C. C. CHENEY. AUTOMATIC CHECK VALVE FOB GOMPRESSED HR DRILYUNG MACHINES.

RFPLICATION FILED )ULY l0. |915. Y

Patented Mar. 20, 1919.

` 2 SHEETS-SHEET l.

ll IT) [15S C. C. CHENEY.

AUTOMATIC CHECK VALVE FOR COMPRESSED AIR DRILLING MACHINES.

i APPLICATION EILE IULY I0, 1919- LQQSJIY. Patented Mau. 2;), 1919.

` i270' @Zi lwhom t may concern.'

CHARLES C. CHENEY, CHARLESTOWN, MASSAICHUSETTS, ASSIGNOR TO FREDERICK'K. DAGGETT, 0F BROOKLINE, MSSACHUSETTS.

'AUTOMATIC'l CHECK-VALVE FR "COMPRESSED-IB DRILLING-MACHIN ES.

Leeaoov.

Be it known that I, CHARLES C. CHENEY, a citizen of the United States,residing at Charlestown, in the county of Suffolk, in the State ofMassachusetts, have invented a certain new. and useful Improvement inAutomatic YCheck-Valves for Compressed Air Drilling-Machines, of whichthe following is a specification, reference -being had to theaccompanying drawings.

The object of this invention is to provide simple but eiective emergencymeans for automatically and promptly shutting off the air pressure incompressed air drills whenever the drill point encounters a hard spot orfor any other reason, is set back by rea-V son of abnormal resistanceand, with that desirable end Tin View, have provided the annexeddrawings 1n which the Figure 1 isv a side view of shut-ofi mechanismembodyu ing my present improvement and Fig. 2l is an end view of thesame. Fig. 3 isa central, longitudinal, sectional, view of saldshut-ofi' taken at the line 3-3 of said Fig. 2, and Fig. 4 is atransverse sectional view of same takenat the line 4-4 of the Fig. 1. InFig. 5 I have shown, by a perspective view, on a relatively reducedscale, a compresse air drill having my emergency device properlyAlocated in theair'line pipe.

Fig. 6 is'an Va'p'prorrimately full size sideview of the customary liveair venting'handle and Figi. isa view of the same as seen' .from the uperside'of said Fig. G..

longitudinal, central, sectional, view of said handle,taken on tl clines-8,

yFig'. 8 is oft-Fig. f?. Figs. Sand 10v are transverse, sectional, viewsof the. handle taken, respectively,

shutcfi'device 'is indicated by the numeral 10'v said housing beingcoredor' bored, and tapped, at one end" to receive a coupling 11 at thelines 9-,9 and l1 0---10 of' i fIn these drawings the housingptmy'descri specification of Letters Patent. Patented Mar, 25, 1919.Application led July 10, 1918. Serial No. 244,158. i

' the said chamber being, however, practically closed at the vendadjacent'to the coupling 12 by means of a wall 14. Within the chamber13. is slidably mounted a plunger 15 u pon one end portion of which aremounted ring packings 16 which serve to prevent the passage of thecompressed air through the chamber 13 but permit the plunger 15 totravel forward and backward in said chamber Vwith reasonable freedom.

The other end portion of said plunger is turned down as at 16a, to fiteasily in an opening 17 in the wall 14, and tapped into the end of saidturned' down portion is the shank of a valve disk 18 which is located inalinement, but normally out of contact, with a valve seat 19 which isformed in the in-i ner end of the coupling 12 already described. Screwedupon the turned down portion of the plunger is a knurled adjusting nut20'/ whichis exposed to view by cutting away the housing 10 as at 10a.'Mounted also upon the turned down portion of the plunger isa stiffspiral spring 21 one end of which abuts the wall 14 and its other endabuts the adjusting nut 20. Spring 21 acts with a constant tendency toforce the valve disk 18 d away from its seat 719, andthe tension of saidspring may be readily increased or reduced by properly rotating the nut20.` By preference the plunger is slotted longitudiscribedY slot and'"screw construcuon serving Iunger-and to prevent it from rotating in ltsvseat in the housing.

' The numeral 24 denotes a by-pass which provides anunobstructed passagebetween the open end portion of the chamber 13 and the opning-finthelcoupling' 12, when the Fig. l3. -The described automatic shut-oil'device'is interposed between the'drill cham- /ber a and" the customarylive air venting` handle, said venting handle being illustrated inldetail in Figs. 6 to 1Q of the drawings and consisting essentially of atwo`-part vented tubular member and a cam-controlled shutfoi valve whichis slidably mounted in Said handle member. The numerals 25 and 26 denotethe two parts of the handle, said parts being screw-threaded together at27 the part 25 being threaded exteriorly as at nally, as at 22, toreceive the end of c screw ,23 which 1s '.'ixedf in the housing; the dedvalve 1s normally open, as seen 1n los'v .pass normali)v to 25a to screwinto the nipple 11 which connect-s the. venting' handle with applicantsautomatic checking device 10. llotatablv mounted on the venting' handleis a milled fel-rule 2S which is formed with a diagonal cam slot. Q9 inwhich is located the l aad ot' a screw BO that is tapped into the stemot a valve 31 that is Slidablv mounted in the handle member '25; thearrangement and operation ot' the. laat described parts being' suchthat. when the. i'ferrule QS is partiallv rotated, thcvalve $51 will beslid forward until it is seated in the cupped end QG ot the nipple QGand will thus `ahnt ott the flow of air. By the same action a ventopening)T Q5" in the member 25 is caused to register with nu opening 2Sin the terrule itl thus venting the live air and reducing temporarilvthe pressure in the main air line bchind the plunger 15.

The described ventinfr handle and its valve 31 form no part of mypresent improvement excepting in so tar as they cooperate with In'automatic shut-otl (lrdinarilvthe quick action ot' the operator of the.machine is relied upon to rotate the terrule QS, and to thue sluit ottsthe air pressure Yfrom the drill whenever the drill encminters a. hardspoty or. 'for an)Y other reason, meets almormal resistance. but suchmanual operati-fm of the shut. ott is frequenti)v too slow to preventthe breaking ot the drill whereas my automatic shut-ott' operatesinstantlj,Y whenever the drill meets an obstruction.

lVhen it. is desired to start the. drill again it is only necessary toopen the valve Si and close the vent. Q5 b v a partial rotation 0fferrule QS when the tlow of air passing'. under normal pressure. intothe chamber 13. is overcome by spring Q1 and the special Valve 18 isopened. thus permit-tine the air to follow the 'ny-pass Q4 as Erst.above described by me.

The operation ot' my improved emergency .shutfoit is as tollowszmSolongas the drill encounters no abnormal obstruction the supply of air.under compression, flows frechY through the. ley-pass 2l and through thecoupling 12 but., in the. event. that the tool strikes a. hard spot. orother obstruction, and the flow oi air is therebyv cheeked, theairpressure'is instantly increased in the housing and ily-pase and. actingon the plunger 15, forces said plunger t'orward and thus forces thevalve dish 1 3 into its seat. 19 and cuts ott' the pressure from thelcom plingr 12 and from the drill.y )is soon. however,'as the abnormalresistance. is removed from the drill and the. air is permitted to andthrough the tool holder, the pressure at the rear end ot plunger 15 isreduced and the spring` 21 instantly vforces the 'alve disk 18 away fromits seat.

19 and thus opens the air line airain.

My device could obviously also be worked A naanoo? bj.' connecting thefluid pressure supply to the opening 1) opposite the valve 18. and thetool to the nipple 11 opposite the plunger 15. in which ease theoperation of said regu latine' device would be resumed automati-y aty aninopportuno time, before the cause of the stoppage of the. tool has beenentirely -@mmnd 1t. is of importance, moreover, for the control of theapparatus to malte its operation noty dependent upon the back pres-`-ure of the tiuid supply upon the. valve lll.

lli' placing the spring 2l at the valve end of the regulator betweenadjustable abutting meansr 20 ot' substantially ident-ical diameter withthe cavity ot the. casing, and the abutmenta-onstilutingl valve end ofsaid casing, Iv

am enabled to var v the operative length of the plunger end and toproportion the tool from resuming` its operation too soon orspiiiie-aml:1ir cushion created at the valve 95 end ot' the casing inaccordance with the length of tbe plunger, the Stop 23 being' placedintermediate the. abutment nut 20 and the. plunger, acting both as ameans et preventing the closimgT up ot the chamber 13, and as a meansot' limitingthe adjustability or' the nut 20. and ot the cushioningmeans at the valve end ot the casinf. The operating fluid retained inthe cylindrical depression of the plunger 15 acts as an air cushion prefto the .sudden expansion of the spring-air cushion at the valve end ofthe device, and it counter-acts moreover, the action upon the ventingvdevice, and upon the regulator itself which is caused by the suctioncreated by the. rapidl)v rotating` movement of the drill borer which isconnected to the valve side of the regulator at 1Q. B v providingspringand-air cushioning means at both ends of the regulator which formsthe subject of my invention any tendency of the regulator toy .stickunder abnormal pressure or under abnormal suction is etleetuallvovercome, and a better 'and easier regulation and control of both the'alve end as well as of the plunger end ot the device is obtained thanwould be possible b v placing' the cushioning means at the. plunger endonly and by arrangingl theV motion-limiting means 223, 22 intermediatethe plunger and the valve the stop 1s never -105 venting thc destructionet' the stop Q3 and exl cessive thrusts on the ditlerent parts of theregulator incident upon the release ofthev abnormal pressure in thechamber 13 owing ,subjected to the combined action of the full-lf3weight of the regulating means and of theair-and-spring cushioningmeans, but it is only subjected to part of the weight of this 4'producedby stops mounted at or near the ends of valve stems; furthermore thanthat,

tbe/'oscillating and twisting tendency and the "an'gular movement of thefree end of valve stemsof the kind last referred to and which resultslin a jamming and lateral sticking or binding action of the valve sternin its'bearings or guides, 1s thereby entnely overcome,

so as to insure an absolutely axial movement of the regulating partwhich is the vital part of the operating tool.

Having thus described my invention, I claim l. In a fluid pressureoperating device the combination with open-ended iluid conducting meansin axial alinement and in spaced relation with each other and a by-passconduit connecting said conducting means and a reciprocating valve rodintermediate said conducting means and in axial alinement therewith, ofa casing surrounding said valve rod, adjustable abutting means on saidvalve rod, abutting means at one end of said casing and integraltherewith, anencircling spring between said abutting means, and nearYone end of said valve rod, a substantially cup shaped plunger at theother end of said valve rod, pin-and-slot motion limiting meansintermediate the plunger and said adjustable abutting means.

Q. ln a fluid-pressure tool-operating device the combination withopen-ended iluid conducting means in axial alinement and in spacedrelation with each other, and a bypass conduit connecting saidconducting means, and a reciprocatory valve rod intermediate saidconducting means and in axial alinement therewith, of a casingsurrounding said valve rod', a'plunger having a, cylindrical open-endeddepression at oney end of said valve rod', a valve at the other end ofsaid valve rod, an abutment on said casing adjacent said valve, anadjustable substantially cylindrical abutment on said valve rodintermediate the plunger and said valve yand fitting the cavity of saidcasing, an encircling spring between said abutments, and motionlimitingmeans intermediate the adjustable abutment and the plunger.

3. ln a fluid-pressure tool-operating device the combination with twoopen-ended fluid conducting means in axial alinement and in spacedrelation with each other, a bypass conduit connecting said conducting Imeans, and a reciprocatory valve rod intermediate said conducting meansand in axial alinement therewith, of a casing substantially surroundingsaid valve rod, a valve at one end of said ,valve rod opposite one ofthe fluid conducting means, a plunger at the other en d of said valverod opposite the other fluid conducting means, an adjustable abutmentonsaid valve rod intermediate the plunger and the valve, an abutment onsaid casing adjacent said valve, spring acting means between saidabutments, a venting handle connected to the fluid conducting meansopposite the plunger, a source of fluid pressure connected to saidventing handle, and a tool connected to the other 'fluid conductingmeans.

4. In a fluid-pressure tool operating device as specified in claim 2,venting means connected to the fluid conducting means opposite, a sourceof fluid pressure connected to said venting handle, a tool, operativelyconnected to the other fluid conducting means.

5. In a fluid pressure tool operating device the combination withopen-ended fluid conducting means in axial alinement and in spacedrelation with each other and a bypass conduit connecting said conductingmeans, a reeiprocatory valve rod intermediate said conducting means andin axial alinement therewith, of a casing substantially surrounding saidvalve rod, a valve at one end of said valve rod opposite one of thefluid conducting means, a plunger at the other end of said valve rodopposite the other iluid conducting means, an adjustable Aabutment onsaid valve rod intermediate the plunger and the valve, an abutment onsaid casing adjacent the valve, spring acting means between saidabutments, venting means connected to the fluid conducting meansopposite` the plunger, a source of fluid pressure connected to saidventing means, and a tool operatively connected to the fluid conductingmeans opposite the valve.

6. In a fluid pressure tool-operating device the combination withopen-ended fluid conducting means in axial alinement and in spacedrelation with each other, a by-pass conduit connecting said conductingmeans, and a reciprocatory valve rod intermediate said conducting meansand in axial alinement therewith, of a casing substantially surroundingsaid valve rod, a plunger having a cylindrical open-ended depression atone end of said valve roda valve at the other, end of said valve rod, anabutment on said casing adjacent said valve, and adjustablesubstantially cylindrical abutting means on said valve rod intermediatethe plunger and said valve and fitting the cavity of said casingspring-acting means between said abutments, and normali withdrawingsaid' the adjustable abutting Ineens and the plunger, venting meansconnected to the `Huid conducting means. opposite the plungei', etsource of fluid pressure connected to said venting means, and e, tooloperatively connected to the uid conducting means opposite the valve.

7. In a fluid piessureeopeieting device in combination a casing, :Lvalve rod, iecipion czitorilymounted in said casing :i cup shaped partat one end of said vulve rod, :i valve at the other end of Suid rod,inteieonn'nnncit ing fluid-eondueting means, open conduits on seid meansopposite the valve and. the cupshaped part respectively, meansoperatively connected to said valve rod, and normally keeping said valveand seid cup-shaped part at a distance from seid open conduits,motion-limiting ineens at one end of seid cup shaped part a ventinghandle opposite the other end of said cup Shaped pni"t,nnd

meen@ 1/ e tool operatively connected te seid fluid conducting means. l

8. n t lud-pressui1e tooLoperating device in combination, e easing, avalve rod reciprocatoiily mounted in said casing, a substantiallycup-shaped part at one end of said valve rod, a valve at the other endof said valve rod, inteicommunicafting fluidcondueting means, open-endedconduits on Said ineens opposite tlie valve and the Cupshaped' paitrespectively, means operatively e,

connected to seid valve i'od, and normally keeping Suid valve and saidcup-shaped part at e distance from seid open conduits, motion limitingmeans at one side of said cup shaped part, t venting handle opposite theother side of said Cup-shaped part, and a drilling tool operativelyconneeted to said fluid conducting means opposite Suid valve.

CHARLES C. CHENEY.

